This is a Ruby Programming Language icon. We've made it in iOS style, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 12,900 icons, all in the same style and quality.
The icon had a octagon shape at the center of it and is surrounded by various triangle shapes both upside down and right side up. Under the triangles at the very bottom are to upside down right angle triangles. Together they all form a gem-like shape.